On the Kanto website they recommend these stands for their YU2 speakers, which are almost identical in size to the A2/A2+ series:
Kanto YU2: 3.9" wide, 5.9" tall and 5.3" deep; 3lbs/2.8lbs
Audioengine A2: 4" wide, 6" tall and 5.25" deep; 3.55lbs/3.15lbs
So these should work fine with the A2 series. I'm thinking of ordering a set of these to go with my A2's since these look a heck of lot higher quality than the hollow plastic of the official Audioengine DS1 stands.